Keswick Weather in September
What's the weather like in Keswick (England) in September 2025?
The climate in Keswick during September can be summarized as mild and very wet.
September is in the fall / autumn in Keswick and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 7°C (45°F) is normal.
| Daytime temperature | 14°C 57.2°F |
|---|---|
| Nightly temperature | 7.2°C 45°F |
| Average temperature | 10.6°C 51.1°F |
| Daily sunshine | 4 hrs |
| Avg rainfall | 272 mm 10.7 ins |
| Rainy days | 19 days |
| Sea temperature | 14.4°C 58°F |
| Humidity | 90% |
| Windspeed | 15.8kph 10 mph |
On average September is the 5th wettest month of the year in Keswick with around 272mm 10.7 inches of rain making it a very wet time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 hours of sunshine per day.
September temperatures in Keswick
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Keswick in September 2025.
Other monthly averages
Best places to visit in September
Keswick weather stats
| Hottest month: | July | 16.6°C 61.9°F |
|---|---|---|
| Driest month: | May | 152mm 6ins |
| Sunniest month: | May | 6.3hrs |
| Coldest month: | February | 3.9°C 39°F |
| Wettest month: | December | 328mm 12.9ins |
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